Car-door-operating mechanism.



0. A. LINDSTRO'M.. GAR DOOR OPERATING MEGHANISM APPLICATION FILED NOV'. 20, 1907.

Patented Nov. 9, 1909.

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S E s S E N W. W

APPLICATION FILED NOV. 20. 1907.

Patented Nov. 9, 1909.

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IIIIIIIIII Fl TL .L illlllilii i I 5 WITNESSES c. A. .LINDSTRO'M. GAR DOOR OPERATING MECHANISM.

M i APPLICATION FILED NOV. 20, 1907. 939,425. Patented Nov. 9. 1909.

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WITNESSES c, A. LINDSTRO'M. UAR DOOR OPERATING MECHANISM.

APPLICATION FILED NOV. 20,1907.

Patented Nqv.9. 1909.

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WI NESSES NIT ii SATES TENT OFFICE- CHARLES A, LINDSTRfiM, 0F ALLEGHENY, PENNSYLVANIA, ASSlIGNOR TO'PRESSED STEEL CAR COMPANY; OF PITTSBURG, PENNSYLVANIA, A CORPORATION NEW JERSEY.

CAB-DOOR-OPERATING MECHANISH.

Application filed November 20; 1907. Serial no. 402,989.

To all whom it may concern:

Be it known that I, CHARLES A. LIND- s'rnon, a citizen of the United States, and resident of Allegheny, in the county of Allegheny and State of Pennsylvania. have invented certain new and useful Improvements in Car-Door-Operating Mechanism, of which the following is a full, clear, and accurate description.

The object of the present invention is to provide an improvement in the class of door operating mechanism for gondola cars having flush drop doors and of a particular kind as illustrated in Patent No. 791,348issued May 30, 1905, issued to -myself and John F. Streib. In this patent chains are used for lifting the doors in position and it has been noticed that with some classes of lading the chains when the doors are down 1 the object of doing away vwith the chains and at the same time retain the other good' features of the earlier patent, namely, a

shaft which will move from a position outside of the doors when they are open to a position underneath the doors when they are closed, to make it absolutely impossible that the doors should become accidentally opened. To obtain this result I make use of two shafts for each set of doors, instead of one. One of these shafts which is located toward the center of the car and near the hinge portions of the doors, is provided with one or more arms to each door. and the one objectof this mechanism is to lift the doors from an open to a closed position and when there is-no load resting uponthe doors and the weight to be lifted is therefore only the weight of the doors themselves. The second shaft, which is located outside of the'doors when the doors are open,- is utilized principally as a safety orlocking device and is rolled or moved beneath the ends of the doors after they have been raised to their closed positions. The moving of this shaft beneath the ends of the door raises the doors upwardly slightly, thus relieving the first operating shaft with its arms from all loads that ma" restupon the doors when they are closed.

In mechanisms of this kind, if applied to railroad cars which are necessarily exposed to more or less rough usage, it is not only Patented No 9, 1909.

necessary that the various palts be' made" stronger, but also that the operation of the various parts be safe and 'be as nearly automatic as possible, so that the less intelligent class of labor employed in the operation of cars of this kind may perform the required functions without having to specially study the mechanism with which the cars may be equipped. and therefore while the operations ofthe two shafts and mechanism described above are different and have different functions, they are so connected that movement of one will operate the other. To accomplish this, and on account of the fact that the work performed by each shaft is of different character, it is necessary to introduce a dead movement ofone shaft, or in other words, a certain amount of movement of one shaft must be made before the other-shaft becomes operative, after .which the other shaft with its attachments is moved until the functions required are performed.

Levers have been heretofore used for raising and supporting the doors in closed position but have been found objectionable by reason of the impossibility heretofore of obtaining a lever mechanism, sufficiently strong to withstand the weight of all loads which may rest upon the doors when they are closed without making the mechanism so heavy as to require great exertion in operating the mechanism.

With the mechanism hereinafter described wherein the support of the doors in closed position is taken from the raising mechanism and placed upon a supporting shaft or device, it possible to make the raising mechanism much lighter as the doors are raised only after the car has been emptied and hence the mechanism may be much more easily operated.

With the mechanism herein described also a means is provided for causing the autoof the, end sills, showing the relative post.

the car lookin'g from the interior toward one tions of the parts when the doors are. in closed os1tion.f Fig. 5 is a sectional detail view s owing the shaft locking means at the operated endof the shaft, such means being partially shown in dotted, lines. ..Fi g. .6 is a detail elevation of the same, looking in the opposite directionfthe door supporting shaft and the camwheel stud being shown in section. -Fig. '7 *is a detail vertical section 1 through an intermediate transom .or crossbearer looking inan opposite direction to thatin Fig. 6, showing the means for con- 1 trolling the movement of and locking the inner end of the supporting shaft, the parts being shown in their closedpositions. Fig.

8*is, a similar. view, the parts being shown in their open door positions. Fig. 9 is a detail viewof'oneof the shaft controlling. devices. i v

-'Referring now in detail to the drawings:

1- represents the carbody of suitable type here shown as 'a gondola, 2 the end sill, 3

the intermediate transoms or cross-bearers, at a double transom or cross-bearer centrally .1'1ocated in the underframe, the bolsters,

and tithe drop doors of suitable number here shown infour sets or; series of four each and occupying the entire floor space of the car bottom (Fig. .1). Doors 6' are pivoted at 7 (dotted lines Fig.3) to hinge lugs mounted on the center sill 8, the structure of which does not concern the present invention. On

each of the doorsb is mounted one or morebearing shoes or plates 9 (Fig. 1) havlng an inclined surface and adapted to be engaged by an antifriction roller 10, carried .bya bifurcated door closing arm or lever 11 ri idly mounted on a shaft 12 (Fig. 3) suitably .journaled in the car underframe, here shown I asmounted on depending brackets or lugs 1 113 mounted on or forming a part ofthe end sills-and several cross-bearers.

' drop doors.

a pair of these arms or levers 11 (F 1g. 2)

There may be. any suitable number of arms or levers 11 for each of the several In the drawings there is shown for each of the drop doors. The drawings also'showfour of the-shafts 12, one for each set-of drop doors 6. Shaft 12 is operated eby a'crank or other suitable means 12 whlch "turn is operated by a link let or other bl'e means secured to aerank gear. 15

- imounted on a-stud 16 seated in a depending I lug-"or bracket 17 mounted on the car underframes-1" forming a part of the end sill, here shown asdepending from the end sill.

1 8 is a stop mounted on gear 15 (F ig.:3) and adapted to limit the movement of link 14 and dog furtheii movement of the gear 15 and link 14 after said link has passed bee yond the center line of the 'axis of crank or gear 15 when the doors have reached a cer .tain stage in their closing movement, so that the tendency of the doors to open under their dead weight when in raised positions, before the locking shaft: 20 is shifted, is counteracted. Movement of the link 14 in an opposite direction, that is, during the being mounted in upwardly disposed slots 21 (FigsJs to 8), formedin the end sills, bolsters and transoms or cross-bearers of the underframe, the lower end of the slots being located near the outer ends of. the bolsters, end sills, 'transoms or cross-bearersyso that as the shafts 20 are moved inwardly, they are forced upwardly. These slots 21 are concentric with the gear 15 (Fig. 3). Each of the shafts 20 has rigidly mounted thereon a gear 22 meshing with a pinion 23 loosely mounted on a pin 24 carried by a bifurcated traveling bracket 25. Bracket 25 is supported at one end by a stud 26 passing through a slot 27.

28 is a washer carried by the stud 26 and bearing against the surface of the bracket 25 and tending to decrease the\ vibratory tendency of the bracket 25. Slot 27 permits bracket 25 tomove back and forth on stud 26..

29 is a lever bifurcated at its lower end and loosely mounted on pin 24 straddling ratchet wheel 23.

30 is a reversible pawl carried by lever 29 in engagement with the teeth of the ratchet 23.

31 is a dog mounted on bracket 25 and adapted to be thrown into engagement with the ratchet 23 to prevent back movement of the parts when the doors are being closed.

It will beseen from the right-hand side of Fig. 3, in which the drop doors are shown in their open positions, that the movement of 1 the lever 29 from the side of the car toward the center imparts motion to the ratchet wheel 23in the. direction of the arrow, moving the gear 22 in the direction of its arrow and forcing the shaft 20 against the outer 1 end of the slots 21, and holding it there and rotating the pinion-19 and gear 15 to open the doors until link lat passes its dead center when the ladingwill complete the opening movement, ratchet 23 allowingthc gears to 1 run away from lever 29. To close the doors it is but necessary to reverse the pawl 30 and throwthe dog 31 into engagement with the ratchet 23 and move the operating lever 29' from the center of the car toward the side, 1

; whereupon an opposite movement of the ratchet 23, pinion 19, gear 22, gear 15 and link 14 occurs, elevating the doors to their identical in shape and length with the sev-- closed os'itions. During the closing movement 0 the doors', as there is a tendency of the pinion '19 to travel over the teeth of the r 15, it is necessary to lock the shaft 20 in its? position at the outer ends of the slots 21. For this purpose a slot-ted locking plate 32is rovided having an arcuate or radial slot 33 eralslots in the end sills, bolsters and transoms or cross-bearers, and adapted to register with these latter in one posit-ion. Plate 32'is also provided with a cam surface 3-1 which'coiiperates with a cam 35 mounted on stud 16 and preferably formed integral with the gear 15, as by forming the gear and cam in a single cast-ing. When the doors open cam'35 rotates with gear and displaces plate 32 throwing slots 33 and 21 out of I regulation;and locking shaft in position.

' plate 32 is further provided with a hub36 (Fig. 5) having an open bearing for shaft 20,'the opening of which is adapted to register with the slot in the end .sill in one cam 35, the sole object being to definitely fix locking plate 32, to

. movement of the shaft 20 through slots 21 at the relation between the gear 15 and the prevent the traveling a certain period in the rotation of the ear 15,thatis untilthe doors have reached t eir uppermostpositions or nearly so, at which l time the cam 35 allows the locking plate 32 to move into a position bringing its slot 33 and the opening in the hub 36' in registration with the "slots 21, (Fig. 6), whereupon further movement of thelever 29 by reason of the link 14 having reached the stop 18 on the gear 15, gear 1 will be dogged which will causeithepinion 19 to travel overthe teeth of ge 'a r 15, thus carrying the shaft'QO .in-

wardly toward the center of the car.

In order to 'teifctively lock both ends of the shaft in its outer position throughout the closing movement ofthe doors and provide a positive feed of shaft 20 toward the center of the car, it is desirable also to have a controlling device at the opposite end of the shaft. ,Such a; device is shown in Figs. 7, 8 and 9', and consists of a pulley 37 rigidly mounted on the end of the shaft 20 and shown in the drawings mounted between a pair of transoms or cross-bearers 4. Connected tothe pulley 37, is a chain 38 secured atone end to theadjustable eye 39, suitably mounted on the transom or cross-bearer 4. A rack 40 is proy' 'ided engaging a series of teeth 41 on the pulley 37 or on a disk 37, in-

tegral'with or mounted to travel with pulley 37. These teeth 41 do not extend completely around the periphery of the said disk or pulley 37 but are suficient only in number, as

shown in dotted lines Fig. 8, to cause the shaft 20 and pulley 37 to travel the distance or length of the'slots 21, the remainder of the periphery of the pulley 37 being plain or toothless and forming a smooth bearing surface against the forward end of rack -10 and traveling movement of the shaft.

The operation of the controlling device at the inner end of the shaft 20 is as follows Assuming the doorsto be closed as shown at the left hand of Fig. 3, the pulley 37, toothed :disk 3?, and chain 38 are in .the positions shown in Fig. "(,shaft 20 is first fed out wardly by pinion l9 and disk 37 traveling over gear 15 and rack 10 respectively, by

reason partly of the rack 40 being rigid and partly because overcoming the inertia of gear 15 oii'ers greater resistance to pinion 19 than the traveling of said pinion 19 over the ends of slots 21, during the rotating nonthe teeth of gear 15. As shaft 20 rotates as it travels, chain 38 unwinds from pulley 37 and rewinds thereoirin an opposite direction. Of course during the automatic movement of the doors, such unwinding and re winding takes place very rapidly..so that by the time the doors have reached their open positions the chain 38 will have rewound on pulley 37 and prevent further rotation of shaft 20, thus preventing the link from being drawn up by excess movement of gear 15 and hence preventing partial rec-losing of the doors. In the closing movement chain 38 performs another function, that is, it-. starts the shafton its travel inwardly This happens after the chain has unwound from the position shown in Fig. 8 and rewound in the opposite direction, thus per mitting about two revolutions of pulley 37 without inward movement of shaft 20 or suf ficientto allow the doors to reach their closed positions before the shaft '20 travels. A de- I tailview of pulley 37 and disk 31' is shown in Fig. 9, wherein they are shown formed of a single casting.

Having shown how the shaft is moved to ward the center of the car and returned. and how such movement is controlled, the efi'ect of the said movement will now be described: On the under surface of each of the drop doors is located one or more bearing horns 42 shown in drawings, two in number, provided with a serrated or roughened surface, and on each of the door supporting shafts is located a corresponding number of loosely mounted devices or rollers -13. also having serrated or roughened surfaces adapted .to engage the roughened-surfaces of their respectlve bearing horns 42. (Fig. l). The door raising arms or levers 11 and the shoes 9 are of suflicient length and depth respectively to, upon the complete upward movement of said arms or levers 11-, raise the drop doors 6- to positions in which the bearing horns 42 are approximately in the plane of the devices or-rollers 43. When the doors have reached such positions through means already described, the shaft begins its movement toward the center of the car, the

devices or rollers 43 striking the bearing.

horns 42 and forcing the doors upwardly into complete closed positions, at the same time raising the shoes 9 from the antifriction rollers 10,-so that it will be seen the entire weight of the doors and the load or lading carried thereby is thrown on the door supbeneath the bearing horns 42, whereuponthe load or lading in the car carries the doors downwardly, the shoes 9 striking the antifriction rollers 10 on the levers 11 oscillating the shaft 12and through the link 14,

I ratchet 24 running away from the lever 29 3 the gear 15 spinningaround the gear 19 and through means of gear 22, the ratchet 24;

by reason of its teeth passing under the dog 31 and the pulley 30, so that it will be seen that the mechanism herein shown and describedis very quickly and safely operated, it being but necessary to impart an initiatmg movement to the ratchet 23, whereuponthe lading immediately completes the open ing movement of thedoors without transmitting movement to lever 29.

At the same time that the gear 15 is spun around by the opening movement .of the doors, caused'by the lading after the shafts 20 have been moved from supporting positions, it will be seen the cam 25 strikes the cam 34 on the slotted locking plate 33 forcing the same into its. locking position, so that the shaftis locked against inward traveling movement until the doors shall have been again returned to their closed or approximately closed positions.

The mechanism thus described is preferably quadrupled so that. there is an operating device on each side of each end of the car. that is four operating levers each controlling one set of mechanism for a set of four doors.

' Having thus described my invention, the following is what I claim therein and desire to secure by Letters Patent 1. In a car door mechanism, a door, means for closing said door, door supporting means geared to said door closing means to move into door supporting position when the door is closed and means for operating said mechanism.

2. In a car-door mechanism, a door and or lever shaft, I

7. In a car-door mechanlsm, a door, a

means for closing said door, in combination with means operatively connected to said door closing means for disengaging said door from said closin means andsupporting said door in close position, and means for operating said mechanism.

3. In a car-door operating mechanism, a drop door, means for raising said door to closed position and door supporting means operatively connected to said door raising means for further raising said door when moved into door supporting position to disengage said door from its raisin means and carry the weight of the door 0 of its raising means.

4. In a car-door mechanism, a suitably mounted shaft, an arm or lever rigidly mounted on said shaft and adapted to close said door and a second shaft adapted to be moved into door supporting position and take the weight of said door from said arm or lever.

I 5. In a car-door mechanism, a door, a suitably mounted shaft, an arm or lever on said shaft adapted vto close said door, a second shaft movable into door supporting position and adapted to take the weight of the door from said arm or lever, suitable operative connections between said shafts to insure their operation in proper sequence and means for operating said mechanism.

7 6. In a car-door mechanism, a door, a suitably mounted shaft, an arm or lever on said shaft for closing said door, a second shaft movable into door supporting position and adapted to relieve said arm or lever of the weight of said door, pawl and ratchet mechanism for operating said door supportin shaft and suitable connection between 'sai pawl and ratchet mechanism and said arm suitably mounted shaft, an arm or lever mounted on said shaft for closing said door, agear, a link connecting said gear and shaft, a door supporting shaft geared to said gear, movable into door supporting position and adapted to relieve said arm or lever of the weight of said door.

8. In a car-door mechanism, a door, means for closing said door, a door supporting means movable into door supporting position, and adapted to relieve said closing means of the weight of said door, suitable operative connection between said supporting and said closing means, means for locking the supporting means until the closing means is operated and means for operating the mechanism.

9. In a car-door mechanism, a door, means for closing said door and means geared thereto, for supporting the door when in closed position, movable into supporting position only after the closin means has operated and means causing disengagement of said door from its closing means when said supporting means is moved into suping means and then move into position to support said door.

12. In a car door mechanism, a door, means for closing said door, traveling means for operating said door closin means, door supporting means carried there y, and means for locking said door closing means to cause said traveling means to shift and carry said door supporting means into door supporting position.

l3. In a car door mechanism, a door, means for closing said door, traveling means for operating said door closing means, door supporting means carried thereby, means for locking said door supporting means in nonsupporting position while said door closing means is operating, and means for locking said 'door closing means to cause said traveling means to shift and'oarry said door supporting means into door supporting position.

14. In a car-door mechanism, a door and means for operating said door comprising a gear, 1n comblnation with traveling door supporting means, a cam mounted on said" door supporting means and adapted to lock said door supporting means in non-support-' ing position, and a cam mounted to travel with said gear and adapted to operate said first mentioned cam.

15. In a car-door mechanism, a door and a toothed device for closing said door in combination with a toothed door supporting device adapted to operate and travel onvsaid door closing device to door supporting position and means for stopping saiddoor closing device at a certain stage of its operation to cause said door supporting device to travel to door supporting position.

16. In a car-door mechanism, adoor and a gear for closing said door, in combination with a traveling 'door supporting shaft, a pinion mounted on said shaft in mesh with said. gear and means for driving said pinion to drive said gear.

17. In a car-door mechanism. a door and a gear for closing said door, in combination with a traveling door supporting shaft. a pinion mounted on said shaft in mesh with said gear, means for driving said pinion to drive said gear and means for stopping said gear at a. certain stage of its movement to cause said pinion to travel and carry said shaft into door supporting position.

18. In a car door mechanism, a door and a gear for closing said door, in combination with a traveling door supporting shaft, a pinion mounted on said shaft in mesh with said gear. means for driving said pinion to drive said gear, means for stopping said gear at a certain stage of its movement to cause said pinion totravel across said gear and carry said shaft into door supporting position, a cam mounted to move with said gear, and a cam device operated by said cam for locking said shaft against traveling movement.

19. In a car door mechanism, a traveling door supporting shaft, means for operating said shaft and means operated by said shaft for locking said shaft against traveling movement durmg a certain period of its operation.

20. In a car door mechanism. a door, a

traveling door supporting shaft for closing said door, and means locking said shaft against movement into door supporting position while the doors are being closed.

21'. In a car door i'nechanism. a door, means for closing said door, a rotating shaft for supporting saine in closed position. and a cam device operated by said shaft locking said shaft in non-supporting position and guiding said shaft in passing into door supporting position. I v

In. a car-door mechanism, a door. means for closing said door, a rotating shaft for supporting same in closed position and cam means operated by said shaft locking said shaft in non-supporting position.

23. In a car door mechanism, a door,

means for closing said door. a rotatipg shaft ment of said shaft to carry the same beneath the door. andcam means operated by'said shaftfor locklng said shaft against traveling movement until the door 15 closed.

24. In a car door mechanism, a door. a

rotating traveling shaft movable to a door supporting position beneath said door, an open bearing for said shaft adapted to'allow said shaft to pass therefrom to door supportmg position, and means for operating said V bearing to prevent the shaft therefrom.

25. In a car door mechan sm. a door, a

shaft movable to a door supporting position,

a slottedcam actuated plate having an open hub forming a guide and bearing for said shaft and actuated plate to move the opening in its hub to a position out of line of movementof said shaft to lock said shaft.

26. In a car mechanism. a door and a shaft movable into door supporting position in combination with at-slotted plate forming a bearing and guide for said shaft and movrom able to carry its slot out of line of travel with said. shaft to lock the latter.

QTIIn-Qa car mechanism, a door and a shaft-iiiovable into door supporting position, a slotted. journaled plate having an open bearing and forming a guide for said shaft, :1 gear operated by said shaft a cam carried I by said gear and operating said slotted'plate to turn the same and carry the slot and open bearing therein out of the line of movement of said shaft tolock the shaft.

28. In a car doorlnechanism, a door, a gear for operatingsald door, a stop on said gear, a link connecting said gear wlth said door and adapted to engage said stop, a

rotating traveling shaft, a pinion carried by said shaft and meshing with said gear, and a suitably; journaled slotted plate having an open bearing forming a guide and bearing for said shaft.

29. in a car door mechanism, a door,

means for operating said door, a shaft, a.

toothed device on each end of said shaft, means for engaging said devlcesto cause said shaft .to shift its position, and means for preventing said shaft from shiftingits position until the door isclosed.

30. In a car. door mechanism, a door,

means for operating said door, a shaft, and

an intermittenttraverse gearat each end of saidshafh 31. A car door mechanism comprising a door, a door operating gear having a limited movement,- a rack, a rotatable and bodily movable .do'or supporting shaft, a gear on said shaft in mesh with said door operating gear and a mutilated pinion or gear on said shaft in mesh with sa d rack.

32; A car door mechanism comprising a door, adoor operating gear having a limited movement, a rack, a rotatable and bodily movable door supporting shaft, a gear on said shaft'in mesh with said door operating gear, a mutilated pinion or gear on said shaft adapted to mesh with said rack and a i cable winding on said shaft to cause said mutilated rack,

33. A car door mechanism comprising a pinion or gear tofmesh with said door, a door operating gear having a limited ion and a 'rack'for shifting said shaft.

35. In acar door mechanism a door and a shaft 1n comblnation wlth a cable winding on said shaft in one direction to shift said shaft and winding on said shaft in an opposite direction to stop movementof said shaft.

36. In a car 'door mechanism, a door, a shaft, a pulley on said shaft and a cable Winding onsaid pulley in either direction to shift the shaft in one direction and limit its 38. In a car door mechanism, a drop door,

an oscillating shaft, an arm on said shaft having a movable engagement with said door for raising same, a crank for operating said shaft and a link connection between said shaft and crank adapted to pass beyond the center line of the crank axis in closing the door.

39. In a car door mechanism,a drop door, means having a movable engagement with said door for raising the same, a bodily movable shaft for locking said door in raised position and a gear crank operated by said shaft for operating said door-raising means.

40. In a car door mechanism, a drop door,

means having a movable engagement with said door for raising-the same, a crank for operating said door-raising means, a connection between said crank and door-raising means having a limited movement beyond the center line of the crank axis and means for locking said door in raised position operable at the limit of said movement.

41. In a'cardoor mechanism, a drop-door, a door-raising arm having a movable engagement with said door, a bodily movable door-locking shaft and means foroperating said arm and shaft.-

42. A car provided with a hinged or pivotally mounted door, means for raising said door, a shaft arranged parallel to the front edge of the door and adapted to be moved underneath same to form a support therefor,

and a device on the door constructed to receive said shaft and thus retain the door in its closed position; substantially as described.

43. A car provided with a hinged or pivotally mounted door, means for raising said door, a rotatable shaft arranged parallel to the front edge of the door, means for causing said shaft to shift bodily toward and away from the door when rotary movement is imparted thereto, and a device on the underneath side of said door constructed to receive said shaft when it moves underneath the door; substantially as described.

44. In a-car'door mechanism, a drop door,

. a shaft for raising said door, a second shaft for supporting said door when in raised position and suitable connection between said shafts from the porting position after preliminary non- ,translating movement thereof. I

, so. In a car door mechanism, a discharge door, a rotatable bodily movable shaft for supporting said door 111 .closed posltion, a

slotted bearing for said shaft having a depressed portion at-one end to receive and retain said shaft, means operated by said shaft for closing the door and means operable after door closing rotation of said shaft to force said shaft out of the depressed portion toward its door supporting position.

4:7. In a car door mechanism, a door,

means for closing said door, door supporting means operat vely connected to said door closing means to move intodoor supporting position when the door. is closed and means for operatingsaid mechanism.

48. In a'car door mechanism, a door, and

means for closing said door, in combination with means operatively connectedto said door closing means for supporting said door in closed position, said door supporting mean movable into supporting position only after the closing means has. operated and means causing disengagement of said doorfrom its closing means When said supporting means is moved into supporting position.

' 49. In a door operating mechanism, a door, 1neans for raising said door and means disconnecting said door from its raising means after the door raising operation.

CHARLES A. LINDSTRUM. Witnesses:

T. J. Jonas, G. C. LAMBE. 

